Magnetic Susceptibility of the Kagome Antiferromagnet ZnCu_3(OH)_6Cl_2

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  • 4 January 2007
Abstract
We analyze the experimental data for the magnetic susceptibility of the material ZnCu_3(OH)_6Cl_2 in terms of the Kagome Lattice Heisenberg model (KLHM), discussing possible role of impurity spins, dilution, exchange anisotropy, and both out-of-plane and in-plane Dzyloshinski-Moriya (DM) anisotropies, with explicit theoretical calculations using the Numerical Linked Cluster (NLC) method. The high-temperature experimental data are well described by the pure Heisenberg model with J=170 K. We show that the sudden upturn in the susceptibility around T=75 K is due to small DM interactions (~J/10). We also observe that at intermediate temperatures, below T=J, our calculated magnetic susceptibility for KLHM fits remarkably well with a power law T^{-0.25}, and suggest possible origins of this behavior.

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